DAC 2 Click

How does it work?

DAC 2 Click is based on the LTC2601, a single 16-bit rail-to-rail voltage output digital-to-analog converter from Analog Devices with built-in high-performance output buffers. The DAC output (VOUT terminal) can directly drive capacitive loads up to 1000pF or current loads up to 15mA and maintains good linearity to within millivolts of both supply rails. The LTC2601's guaranteed monotonic performance is ideal for digital calibration, trim/adjust, and level setting applications in various applications.

This Click board™ communicates with MCU through a 3-Wire SPI interface (write-only) with a maximum frequency of 50MHz. The LTC2601 also provides an asynchronous clear pin routed to the RST pin of the mikroBUS™ socket, which is required in many servo and control applications. A logic low level at this level-triggered pin clears all registers and causes the DAC voltage outputs to drop to 0V. It also sets all registers to midscale code and causes the DAC voltage outputs to go to midscale.

The MCP3551 uses a reference voltage as the differential voltage range, like any DAC. The reference voltage level selection is performed by positioning the SMD jumper labeled REF SEL to an appropriate position choosing between 3.3V or 5V provided by the mikroBUS™ power rails or 4.096V provided by MCP1541. Those voltages may be used as the reference input that results in accuracy and stability.

This Click board™ can operate with both 3.3V and 5V logic voltage levels selected via the PWR SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to use the communication lines properly. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development.

Specifications

Pinout diagram

This table shows how the pinout on DAC 2 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
	NC	1	AN	PWM	16	NC
Asynchronous Clear	CLR	2	RST	INT	15	NC
SPI Chip Select	CS	3	CS	RX	14	NC
SPI Clock	SCK	4	SCK	TX	13	NC
SPI Data OUT	SDO	5	MISO	SCL	12	NC
SPI Data IN	SDI	6	MOSI	SDA	11	NC
Power Supply	3.3V	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

DAC 2 Click electrical specifications

Software Support

We provide a library for the DAC 2 Click as well as a demo application (example), developed using Mikroe compilers. The demo can run on all the main Mikroe development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for DAC 2 Click driver.

Key functions

• This function executes default configuration for LTC2601 click.

• This function required percentage value ( from 0% to 100% ) convert to digital input and transforms it to the output voltage from 0 to Vref [mV].

Example Description

This example code presents the usage of DAC 2 Click, and digital-to-analog converter.

 void application_task ( void ) 
 { 
     uint16_t voltage_out; 
     uint8_t value_pct; 

     for ( value_pct = 0; value_pct <= 100; value_pct += 10 ) 
     { 
         dac2_write_output_voltage_procentage( &dac2, value_pct ); 
         voltage_out = value_pct * 50; 
         log_printf( &logger, "Voltage Output: %d mVrn", voltage_out ); 

         voltage_out = value_pct; 
         log_printf( &logger, "Percentage Output: %d %%rn", voltage_out ); 

         log_printf( &logger, "--------------------------rn" ); 
         Delay_ms( 5000 ); 
     } 

     log_printf( &logger, "###############################rn" ); 
     Delay_ms( 1000 ); 
 }

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Dac2

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all Mikroe compilers.

mikroSDK

This Click board™ is supported with mikroSDK - Mikroe Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.

For more information about mikroSDK, visit the official page.